Up to now, the effect of strain rate on the adhesive bond shearing resistance of stiff clay, which plays a fundamental role in constitutive modeling of such kind of soils, remains unclear. This paper aims to experimentally investigate the strain rate dependency of the adhesive bond shearing resistance of stiff clay. Both undisturbed and reconstituted overconsolidated samples of Merville stiff clay from the Flanders region in the north of France are prepared with different overconsolidation ratios (OCR, up to 56). Oedometer tests and undrained triaxial tests under different confining stresses on samples with different OCRs are conducted. The effect of inter-particle bond is gradually investigated by comparing test results of undisturbed and reconstituted samples with the same OCR. All results suggest a uniqueness of the strain rate dependency in one-dimensional and triaxial conditions with different OCRs for the reconstituted clay, whereas the strain rate dependency of shear strength of overconsolidated clay is found to be higher in undisturbed samples than in reconstituted samples due to inter-particle bonding. This new finding is formulated as the adhesive bond shearing resistance against the strain rate, which should be useful for improving the time-dependent modeling of highly overconsolidated stiff clays.

到目前为止，尚不清楚应变速率对硬质粘土的粘接剪切性能的影响，而硬质粘土在这类土壤的本构模型中起着基本作用。本文旨在通过实验研究硬粘土黏结剂抗剪切力的应变率依赖性。来自法国北部佛兰德地区的默维尔硬质粘土的原状和重组超固结样品均采用不同的超固结率（OCR，最高为56）制备。在具有不同OCR的样品上，在不同的限制应力下进行了里程表测试和不排水三轴测试。通过比较具有相同OCR的未扰动和重构样品的测试结果，逐渐研究了颗粒间键合的影响。所有结果表明，在重构的黏土中，在一维和三轴条件下具有不同OCR的应变率相关性是唯一的，而未固结样品中的超固结土的剪切强度对应变强度的应变率相关性则比在重构样品中高。粒子间键合。这一新发现被表述为抵抗应变速率的粘合剂剪切强度，这对于改善高度固结的硬质粘土随时间变化的建模应该是有用的。